LIFE 102 Lecture Notes - Endergonic Reaction, Atp Hydrolysis, Activation Energy
Document Summary
The three types of cellular work (mechanical, transport, and chemical) are powered by the hydrolysis of atp. In the cell, the energy from the exergonic reaction of atp hydrolysis can be used to drive an endergonic reaction. Atp drives endergonic reactions by phosphorylation, transferring a phosphate group to some other molecule, such as a reactant. Atp is a renewable resource that is regenerated by addition of a phosphate group to adenosine diphosphate (adp) The energy to phosphorylate adp comes from catabolic reactions in the cell. The chemical potential energy temporarily stored in atp drives most cellular work. Concept 8. 4: enzymes speed up metabolic reactions by lowering energy barriers. A catalyst is a chemical agent that speeds up a reaction without being consumed by the reaction. Hydrolysis of sucrose by the enzyme sucrase is an example of an enzyme-catalyzed reaction. Every chemical reaction between molecules involves bond breaking and bond forming.
